R help - Jun 2010 - Fastest way to merge matrix columns into a comma delimited string?

Folks:

Say I have a matrix:

test=matrix(c(1,2,3),nrow=10,ncol=3)

I would like to have an output character vector where each line is
row's values delimited by commas, e.g.:

"1,2,3"
"2,3,1"
"3,1,2"
...
"1,2,3"

What is the fastest way of doing this?  I can paste() row-by-row but
this seems an inefficient approach to doing this.  Thanks!  I'm not
asking how to write a CSV file, mind you, I want the array as an R
data.frame or vector.

--j

> apply(test, 1, paste, collapse=",")
 [1] "1,2,3" "2,3,1" "3,1,2" "1,2,3"
"2,3,1" "3,1,2" "1,2,3" "2,3,1"
"3,1,2"
[10] "1,2,3"


On Tue, Jun 15, 2010 at 2:27 PM, Jonathan Greenberg
<greenberg at ucdavis.edu> wrote:
> Folks:
>
> Say I have a matrix:
>
> test=matrix(c(1,2,3),nrow=10,ncol=3)
>
> I would like to have an output character vector where each line is
> row's values delimited by commas, e.g.:
>
> "1,2,3"
> "2,3,1"
> "3,1,2"
> ...
> "1,2,3"
>
-- 
Sarah Goslee
http://www.functionaldiversity.org

apply(test, 1, paste, collapse = ",")


On Tue, Jun 15, 2010 at 11:27 AM, Jonathan Greenberg
<greenberg at ucdavis.edu> wrote:
> Folks:
>
> Say I have a matrix:
>
> test=matrix(c(1,2,3),nrow=10,ncol=3)
>
> I would like to have an output character vector where each line is
> row's values delimited by commas, e.g.:
>
> "1,2,3"
> "2,3,1"
> "3,1,2"
> ...
> "1,2,3"
>
> What is the fastest way of doing this? ?I can paste() row-by-row but
> this seems an inefficient approach to doing this. ?Thanks! ?I'm not
> asking how to write a CSV file, mind you, I want the array as an R
> data.frame or vector.
>
> --j
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>